Extreme heat forecast for weekend triggers Extreme Heat Watch in Southwest U.S.
The National Weather Service issued an Extreme Heat Watch for parts of southern Arizona and far southeastern California from the morning of June 14 through the evening of June 16, 2025. Affected areas include the lower deserts of Arizona and southeastern California, where daily maximum temperatures are expected to reach 40°C to 46°C (104°F to 115°F).
Image credit: Colin Lloyd
“Anomalous heat by mid-June standards will continue through mid-week across much of the interior Western U.S. as an upper level ridge governs the overall weather pattern,” the National Weather Service (NWS) forecaster Hamrick noted on Wednesday, June 11.
The affected region includes the lower Colorado River Valley, Imperial County, Parker Valley, the Yuma area, and southeastern sections of Arizona, including the Gila River Valley, Tonopah Desert, Tucson metro, and Upper San Pedro River Valley.
Forecast data indicate afternoon highs between 41°C and 46°C (105°F to 115°F), with minimal overnight relief. This pattern is driven by a strong upper-level ridge over the western U.S., trapping hot, dry air over the region.
Precautionary guidance includes avoiding outdoor exertion during peak heat hours, staying hydrated, using air conditioning or cooling centers, and monitoring for symptoms of heat-related illness. Employers are reminded to follow Occupational Safety and Health Administration (OSHA) guidelines for outdoor work, including access to water, rest, and shade.
Children, the elderly, and individuals with chronic health conditions are particularly vulnerable. Authorities remind everyone living in affected regions to never leave children or pets in vehicles, where temperatures can rise rapidly to fatal levels.
This marks the first issuance of an “Extreme Heat Watch” designation following the March 2025 terminology update by the NWS, replacing the former “Excessive Heat Watch.”
I'm a dedicated researcher, journalist, and editor at The Watchers. With over 20 years of experience in the media industry, I specialize in hard science news, focusing on extreme weather, seismic and volcanic activity, space weather, and astronomy, including near-Earth objects and planetary defense strategies. You can reach me at teo /at/ watchers.news.
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